The common causes of numbness of the sole of the left foot include local nerve compression, peripheral neuritis and disc herniation. 1. Local nerve compression: because the left foot wearing shoes do not fit or stilt legs so that the innervation of the left sole of the foot nerve pressure, and the left sole of the foot numbness, generally change the appropriate shoes or change the stilt legs so that the pressure on the nerves to get relaxation, numbness can be gradually recovered. 2. Peripheral neuritis: diabetes, alcoholism and other causes of peripheral neuritis can also appear on the bottom of the left foot numbness. 3. Intervertebral disc herniation: herniated intervertebral disc compresses the nerve that innervates the sole of the left foot, and sometimes there is numbness of the sole of the left foot, which is usually treated by bed rest and traction. There may be other reasons for the numbness of the soles of the left foot, by changing shoes, changing posture is not obvious should be promptly to the regular hospital, the doctor according to the specific condition of the cause of judgment, for the cause of the correct treatment given in a timely manner.